| http://www.w3.org/ns/prov#value | - Even in the 12th and 13th centuries, medical records indicate that wars, famines and various types of epidemics affected health and disease, exerting influence by actually altering the nature of illness.1 Zhang Yuansu, a physician of the 12th century, described the changing clinical landscape as follows: Ancient and modern times follow different patterns of seasonal qi; old prescriptions are less
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